High molecular weight pullulan and method for its production
CA 2080658 C · Owner: Thorne, Linda P. · Inventors: Armentrout, Richard W.; Thorne, Linda P.; Pollock, Thomas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for obtaining a substantially biologically pure culture strain of Aureobasidium pullulans from a wild type strain by enriching the collected strain for organisms which grow as fungal yeastlike cells, growing colonies from isolated yeastlike cells and selecting those yeastlike cells which exhibit reduced pigmentation. Biologically pure culture strains obtained by the invention as well as methods for producing pullulan having decreased pigmentation and/or increased molecular weight are disclosed.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed October 15, 1992 and granted August 11, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 15, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.